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Old 02-15-2024, 09:40 AM   #21
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Originally Posted by Gorzie View Post
Would you have a picture of the different TCMs and ECMs too. My bus is in a weird spot on the production line. It is a 98 model build in May of 97. I was told that somewhere around that time they changed the ECM and I am wondering if they also change the TCM.

I would like to get a 5/6 speed transmission so I can cruise about 65 with no worries on over working the engine. currently I am able to cruise about 60 and the RPMs are a bit higher than I like and of course better gas milage is the main goal. I have gotten an average of 9.1mpg between St. Louis and Springfield, MO. ONCE.
Whats your rear axle ratio?

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Old 02-15-2024, 10:32 AM   #22
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Originally Posted by cadillackid View Post
an SAE3 allison 2000 has the same bolt pattern, converter offset and bolt pattern as the 545.. so in that respect its drop a 545 bolt up a 2000. the big differences are in the support hardware..
I had to mod my shifter bracket.. actually i think I just made a new one altogether to anchor my shift cable. if you have hydraulic brakes with a drum parking brake on the back of the 545 you'll need to find a 2K that already has it or do some fab and mod to the 545 one to work.. air brakes with no drum is no mods needed..



I used an external Neutral safety / backup switch that fits right on the shaft of the shifter to connect my reverse lights and Neutral safety switch.. its a common GMC part..



5 or 6 speed compatible is a function of the year trans and TCM you buy.. the throttle type on your TCM should be stamped as 'J1939'.. 4th gen TCM's (single connector) are 6 speed capable.. 3rd gen (2 connectors) are not.. dont mix N match trans years and TCM years.. if you get a 5 speed trans get a 5 speed TCM, and vice versa with 6 speed..
These are the connectors I have
Attached Thumbnails
front passanger side wire harness.jpg   Back connector.jpg  
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1997 Bluebird IH 3800 6 window T444e
https://www.skoolie.net/forums/f11/m...ird-28058.html
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Old 02-15-2024, 10:33 AM   #23
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ratio is 3.91
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1997 Bluebird IH 3800 6 window T444e
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Old 02-15-2024, 10:51 AM   #24
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Originally Posted by cadillackid View Post
if you open your hood and see a large computer with 2 connectors plugged in right on the passenger side valve cover then its the single box NavPak engine ECM..



your transmission currently is mechanical so there is no current TCM..


looking for a J1939 wiring connection.. on my bus it was tucked into a harness that landed near the front of the right side valve cover.. it was a 3 pin (yellow/green/black) connnector.. of course on the outside its just black but the plastic tubing pulled back easy on the harness to reveal the colors.. it wil be an empty connector. meaning not plugged into anything..



6 speed TCM's all have a single 80 pin connector going into them.. if a TCM for an allison 2000 has 2 connectors then it is the older style 5 speed.. (be aware not to mix TCM's dont buy a TCM programmed for an MD3060 and expect it to properly run an allison 2000)..


with 6 speed, buying a complete take-off from another vehicle gets tougher.. you can certainly get a transmission and harness.. however TCM's for newer engines like Maxxforces use a program called 'SEM' or shift energy management that the 444e doesnt support... using a TCM that has SEM turned on with an engine that doesnt support it results in limp mode and check trans light.. so you'll likely wanbt to contact a 3rd party like jason at transmissiontuner or PCM electronics, etc to obtain your TCM...


going through jason allowed me to get a TCM I can tune with EFIlive and make my own shift tables which has been really nice,esp as ive souped up the engine, I also needed to change how the TCM operates the transmission.. in my case I bought a freshly built (performance) transmission and the tuneable TCM.. so I didnt deal with pulling things from another vehicle..
So this is what they look like right? If so then YES i do not have those.
Attached Thumbnails
ECM pic.jpg  
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1997 Bluebird IH 3800 6 window T444e
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Old 02-15-2024, 11:36 AM   #25
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Originally Posted by Gorzie View Post
So this is what they look like right? If so then YES i do not have those.

correct.. that last pic is a single box NavPak computer and also the J1939 interface connector I was talking about. this is the late model configuration.. generally mid/late 97 through 2004
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Old 02-15-2024, 11:37 AM   #26
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3.91 with what size tires are you running?
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Old 02-15-2024, 12:21 PM   #27
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3.91 with what size tires are you running?
They are 265's. I am planning to replace the rear tires wit 10 or 11 in the future so I can get replacement tires on the road if needed without having to wait a few days. The current tires are in good shape so I hate to replace them
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1997 Bluebird IH 3800 6 window T444e
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Old 02-15-2024, 12:44 PM   #28
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Quote:
Originally Posted by cadillackid View Post
correct.. that last pic is a single box NavPak computer and also the J1939 interface connector I was talking about. this is the late model configuration.. generally mid/late 97 through 2004
Thanks I have been wondering what they looked like. Just found that video this morning.
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